package com.bjc.principle.opc.improve;

/**
 * @program: DesignPattern
 * @description: 开闭原则
 * @author: bjc
 * @create: 2020-12-13 17:36
 */
public class Ocp {

    public static void main(String[] args) {
        //使用看看存在的问题
        GraphicEditor graphicEditor = new GraphicEditor();
        graphicEditor.drawShape(new Rectangle());
        graphicEditor.drawShape(new Circle());
        graphicEditor.drawShape(new Triangle());
        graphicEditor.drawShape(new OtherGraphic());
    }
}

//这是一个用于绘图的类[使用方]
class GraphicEditor{
    //接收Shape对象，然后根据type，来回值不同的图形
    public void drawShape(Shape s){
        s.draw();
    }
}

//Shape类  基类
abstract class Shape{
    int m_type;
    public abstract void draw();//抽象方法
}

class Rectangle extends Shape{
    Rectangle(){
        super.m_type = 1;
    }

    public void draw() {
        System.out.println("绘制矩形");
    }
}

class Circle extends Shape{
    Circle(){
        super.m_type = 2;
    }
    public void draw() {
        System.out.println("绘制圆形");
    }
}

//新增画三角形
class Triangle extends Shape{
    Triangle(){
        super.m_type = 3;
    }
    public void draw() {
        System.out.println("绘制三角形");
    }
}
//新增一个图形
class OtherGraphic extends Shape{

    OtherGraphic(){
        super.m_type = 4;
    }
    public void draw() {
        System.out.println("绘制其他图形");
    }
}
